Resistivity of constantan coursework

Nichrome and Constantan are often used as resistance wire. It is especially used for resistance purpose since its resistance does not change much with the change in its temperature. It is used for DC current shunts.

Apparatus Ensuring Accuracy To ensure accuracy I will record the voltage and the current three times every 5cm and take the average reading. The variables I will control will be the type of wire resistivity and the cross-sectional area of the wire. A high resistivity means that a material does not conduct well electric charge.

For example, a wirewound resistor with a long, thick wire has a higher resistance then with a shorter and thinner wire. Variables There are different variables that can be changed in this experiment; these are the independent variable. The electrical resistance of a resistor is determined by the combination of the shape and the resistivity of the material.

I could also consider using different cross-sectional areas of wires or even change the temperature of the wires deliberately and see how manipulating these variables affect the resistance of the wire.

This alloy has, for example, an adequately high strain sensitivity, or gauge factorwhich is relatively insensitive to strain level and temperature.

On the other hand, in precision electronics this is usually an unwanted effect. It is therefore used in thermocouple alloys, with other metals like iron and copper.

The formula to calculate wire resistance is as follows: In addition, constantan is characterized by good fatigue life and relatively high elongation capability. To a normal human being, exposure to nickel can present some health hazards to them. Types Constantan alloys are of two types: The wire has a length of mm and a diameter of 0.

An analogy with a hydraulic system can be made, where water is pumped through a pipe. The constantan that is available in this form is generally very ductile, and measures about 3mm in length.Electrical resistivity is defined as the relation between the electrical field inside a material, and the electric current through it as a consequence: in.

Mar 05, · OK doing some physics coursework at the moment where I have to measure the resistivity of Constantan. Anyway, for those who don't know, the resistivity of constantan is 49x10^ Anyway the formula for those who don't know for resistivity is RA/l So anyway at length of cm, with a.

Apr 19, · An investigation into the resistance of a wire. Free GCSE physics coursework essay.

The variables I will control will be the type of wire (resistivity) and the cross-sectional area of the wire. I will also control, using the power pack, how many volts pass through the wire. Below is a table illustrating the effect of changing the variables Reviews: - Investigating the Length of Words in Magazines and Newspapers Introduction In this piece of coursework I am going to look at the differences between articles from newspapers and magazines.

I will be looking at the length of the words in each of the articles to see which of them has the longest words. - The Constantan wire is very.

Constantan is a copper–nickel alloy also known as Eureka, Advance, and Ferry. It usually consists of 55% copper and 45% nickel.